Block B1 is a locality within Janakpuri, West Delhi, Delhi. Block B1 has a pincode of . Nearby localities of Block B1 include Block B1, Block B1, Block B 2B, B2A Block, Janakpuri District Center, Block B2, BB Block, Possangipur, Block B 3B, Chhoti Subji Mandi, Block A3, Block B 3A, Block BE, Prem Nagar, Block BD, Shiv Nagar, Narang Colony, Block VA, Chander Nagar, Narang Colony, Gurunanak Pura, BA Block, Block E, A-Block, Virender Nagar, Shiv Nagar Extension, Block C2A, Block A3, Block A3, Block C2B, Block A 2B, Hari Nagar, Block VB, C-2 Block, Asalatpur Village, Block C 4B, Block A 2A, Block C, Block C4A, Block BF, Block C2C, Block AB, Block C 4D, C-1A Block, Block C 4E, C4 D Block, Block C4F, Block A2, Block A1B, Block C4G, Block C 2D, Block C3A, Block C3, Block C-5A, C5B Block, RWA Colony, Block C6B, Block C 6A, Desu Colony, Janakpuri Institutional Area, Lajwanti Garden, Nangal Raya Extention, RC Basti,Block WZ, Nangal Raya, Pocket D 2A, Khera Village, Nangli Jalib, District Centre, Block A1, Karan Market, Block A, Girsa Chowk, Narang Colony, Block A 5B, Pocket 12, Block C 4A, Block A1A, Block C5B, Block C5C, Tihar Jail, Tihar Central Jail, Pocket D 1A, Pocket D 1, D1B Block, Pt.Lakhmi Chand Chowk, Block A 5C, Block C1, Block C5D, Gurjar Samrajya Chowk, Block B3, Block C 4C, Block C4H, D Block, Block WZ, D1-C Block, Pocket D 1C